Without Wife, Penn And Portman Still Together

Natalie's been blamed for the Penns' martial spilt, but the relationship is more than a fling.

Yes, picking up this week's Star might seem a little bit like deja vu. The magazine is reporting that the reason Sean Penn and Robin Wright Penn spilt is none other than ... Natalie Portman!

Now, this little tidbit was in fact was speculated back in March after rumors abounded that Penn and Portman where seen hot and heavily at the Sunset Tower Hotel. However, apparently a relationship between the two has been going on ever since. Diary Of A 23-Year-Old Mistress

Now to be fair, this alleged make out was a few weeks after Penn decided not to thank his wife and kids during the Oscar acceptance speech ... a divorce-able offense in of itself.

However, Penn and Wright Penn have been on the rocks before but have reconciled. But, if there's still another woman in the picture, maybe this breakup is for sure.

And according to the magazine, Portman is still very much in the picture.

A source told Star, "She stimulates him in ways no other person has, mentally or professionally. There’s a lot more there with Natalie than any of the other girls Sean’s been with."

If that's true, there must be something really special about Ms. Portman, because Penn has been tied to a linty of Hollywood's elite. Just a few of the "less stimulating" individuals grouped with Wright Penn would include ex-wife Madonna, Jewel, Lindsay Lohan and Sienna Miller.

The magazine also says that it was Portman's youth that led Wright Penn to give an ultimatum to Penn: Give up the chicklets or else.

"She was furious he was messing around with such a young star," an insider told to magazine. "It made her sickly jealous."

Penn, not to be one upped by his wife, filed for divorce first. Insiders also believe the divorce will not be smooth.